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In this research we present a novel method to measure local optical dichroism in opaque crystal powder suspensions using the photoacoustic effect. Our method is based upon the laser speckle contrast technique, a novel technique to perform photoacoustic measurements that do not require contact with the sample. The main novelty of our work is the development of a simple statistical approach for measuring the chirality of crystal suspensions using the photoacoustic effect, which does not require arranging the crystals with a specific orientation on surfaces. A model chiral system was used to demonstrate our method, we have used Cobalt doped L-Histidine crystals that are photoacoustic active and established our ability to measure their optical dichroism in solution under completely random orientation.
Gil Otis,Matan Benyamin,Yitzhak Mastai, andZeev Zalevsky
"All-optical photoacoustic measurement of localized chirality in crystal suspensions", Proc. SPIE PC12650, Physical Chemistry of Semiconductor Materials and Interfaces XXII, PC126500Q (5 October 2023); https://doi.org/10.1117/12.2670547
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Gil Otis, Matan Benyamin, Yitzhak Mastai, Zeev Zalevsky, "All-optical photoacoustic measurement of localized chirality in crystal suspensions," Proc. SPIE PC12650, Physical Chemistry of Semiconductor Materials and Interfaces XXII, PC126500Q (5 October 2023); https://doi.org/10.1117/12.2670547